Yellow Orb In Eerie Place, Caution?

My house is over 200 years old. I found a hole in a floor under a rug and decided to take pictures under it, just thinking I'd find very old construction methods: squared iron nails, actual tree logs for beams etc. I found those but also a secret room that looks like it's had a new lower ceiling, and they left the top portion. Under the insulation is a new sheetrock ceiling which is my neighbors.

On the top right, I found a light yellow orb in the photo. I've taken a picture there several times again and can't get it to appear. I found that yellow means caution, but about what? Should I be cautious about it or does that mean I should be cautious about anything? My bathroom which is next to the closet I'm afraid of. I can't go in there without feeling threatened and watched.

I also read it can mean you're developing or discovering psychic abilities. It appears to be lighter yellow so maybe it's not "caution"?